Paper Airplane mode:
Complete all 48 levels to unlock “Paper Airplane mode” at the “Options” menu.
Give planes with an emergency, such as “organs transplant” or “baby delivering immediately” priority as they become very impatient, and you will be awarded a medal.
-Serve the larger planes after the small planes if possible to get a bigger combo bonus. Also, bigger planes are more impatient.
-Try buying a repainting plot so you can make all your gateways reach a 4x combo of each color. This is the maximum, and you will get the most combo points and a medal at the end.
Hidden cinematics hint:
Every airport location has a “hot spot” that you can click on for cinematics, dialog, and other hidden features. For example, click the church at Happy Valley Municipal.